typo fixes all over the place

found and semi-manually replaced by using:
 codespell -L mut -L crate -i 3 -w

Mostly in comments, but also email notification and two occurrences
of misspelled  'reserved' struct member, which where not used and
cargo build did not complain about the change, soo ...

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/api2/node/apt.rs

@@ -85,7 +85,7 @@ fn do_apt_update(worker: &WorkerTask, quiet: bool) -> Result<(), Error> {
             },
             notify: {
                 type: bool,
-                description: r#"Send notification mail about new package updates availanle to the
+                description: r#"Send notification mail about new package updates available to the
                     email address configured for 'root@pam')."#,
                 default: false,
                 optional: true,